Radwanska marches on

Pole scores straight-set win over Schiavone; Wozniacki in charge

The world number four skipped Italy's Fed Cup showdown against Russia last weekend to spend more time preparing for her Roland Garros defence but her decision failed to pay off as she was humbled 6-1, 6-3 by Poland's Agnieszka Radwanska in the second round.

While Schiavone works out a way to rediscover her winning touch on red dirt, she might want to take a few tips from world number one Caroline Wozniacki, who thumped Slovakian qualifier Zuzana Kucova 6-1, 6-2 to cruise into the quarterfinals.

The 20-year-old Dane, who won her third tournament of the year in Charleston earlier this month but has yet to win a Grand Slam title, needed just over an hour to dispose of Kucova, ranked 132 places lower.

Wozniacki, with one eye set on the French Open starting in May, was broken in the first game but raced through the next eight before clinching the second set 6-2.

She will have a tougher task in the next round where she will face Australian Open quarter-finalist Andrea Petkovic.

Petkovic battled back in the second set, firing a string of spectacular winners to break the Serbian twice and race into a 5-0 lead before clinching it when Jankovic dumped a backhand into the net.

Petkovic grew stronger with every point and took a 2-0 lead but Jankovic staged a brief comeback to close in 4-3 but then gifted three double faults and the game to her opponent who served out the match.

World number three Vera Zvonareva survived an early scare to beat fellow Russian Anastasia Pavlyuchenkova 3-6, 6-4, 6-2.

The 19-year-old opened up a 5-2 lead as Zvonareva struggled with the pace and depth of her opponent's groundstrokes. Pavlyuchenkova clinched the first set on her third opportunity with a another fierce crosscourt forehand.

China's Li Na had no such escape plan against German Sabine Lisicki who eased past the world number six with a comfortable 6-4, 7-5 win.

She will next face fellow German Julia Goerges, who advanced after fourth-seed Victoria Azarenka retired with a shoulder injury having won the first set 6-4.